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We present a complete analysis of the neutral fermion sector ofsupersymmetric E_6-inspired low energy models containing an extra SU(2),concentrating on the Alternate Left-Right and Inert models. We show that theR-parity conserving scenario always exhibits a large Dirac mass for \nu_L withmaximal mixing with an isosinglet neutrino, and that R-parity violatingscenarios do not change the picture other than allowing further mixing withanother isosinglet. In order to recover Standard Model phenomenology,additional assumptions in the form of discrete symmetries and/or newinteractions are needed. We introduce and investigate Discrete Symmetry methodand Higher Dimensional Operators as mechanisms for solving the neutrino massand mixing problems in these models.Comment: 27 pages, 2 figures; typos correted, version to be published in  Physical Review

physical review. d. particles, fields, gravitation, and cosmology/physical review. d, particles, fields, gravitation, and cosmology

Neutrino masses in the effective rank-5 subgroups of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>E</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>. II. Supersymmetric case

Neutrino masses in the effective rank-5 subgroups ofE6. II. Supersymmetric case